Radio direction finding apparatus
Device for determining the direction of a plane wave
Adaptive direction of arrival antennae system
Amplitude selected phase interferometer angle measuring radar
ApplicationNo. 06/329030 filed on 12/09/1981
US Classes:342/446, Unequal distance between at least three antennas342/417Direction-finding receiver only
ExaminersPrimary: Gruber, Felix D.
Attorney, Agent or Firm
International ClassesG01S 3/14 (20060101)
G01S 3/48 (20060101)
Foreign Application Priority Data1968-09-05 JP
AbstractThis invention relates to a radio wave angle of incidence measurement apparatus which is applicable to radar and other detection systems, and which utilizes an antenna array with radiator elements distributed at a spacing larger than one half of the propagation wavelength. A radio signal is received by an antenna array that exhibit at least two different values of d/λ (where d is the inter-element spacing of the radiator elements, λ the propagation wavelength), and the resultant inter-element phase differences, of which there are at least two sets, are digitally measured. A phase difference converter circuit receives the digital signals representing the inter-element phase differences and processes them and generates an output signal that varies monotonically as the incident angle of the radio signal incident on the antenna array varies.